Is the movie a straight-rip from broadway with just increased visual cues or have things dramatically changed, as in changing and shifting things around like others would need to do in adapting other sources? Musicals just seem to be the easiest form to translate because the same narrative restrictions aren't placed on it that are placed onto other sources. Most of it is already there other than exact visual cues. Really difficult to explain lol, and unsure if I'm doing it right. Just having adapted a musical and a novel, the musical was straight-forward whereas the novel was bound to certain structural changes.
I've seen the stage musical 9 times, the movie 3 times, and I've read the original Victor Hugo novel. It is not a "straight-rip" from the the stage version:
-The stage version opened with Valjean being released from a prison chain gang. On stage, the show opened with he and the other convincts swinging hammers, and Valjean was pushed forward when his name was called to face Javert, who gave him his parole papers. In the film, the convicts are now in the shipyards, in the water, pulling in a ship. Javert now first instructs Valjean to retrieve a waterlogged mast with a fallen French flag, which Valjean lifts demonstrating his superior strength. Valjean is released on parole, and the lyrics have been changed from the stage version.
-During the prologue on stage, Valjean is denied work and a room, because of his papers showing him to be a convict. The dialogue is entirely sung. The film uses entirely new dialogue (not sung) for those scenes, as well as new sequences where Valjean has his parole papers stamped by a judge, is beaten by police and attacked by children throwing rocks.
-After stealing from the Bishop, Valjean is captured and brought back to the Bishop. On stage, the dialogue is entirely sung. The film uses new spoken dialogue.
-On stage, Javert does not return to the story until after Fantine is arrested, when Valjean intervenes and orders she to be taken to a hospital instead (he calls two other men over to carry her off). Before Javert can argue, the accident with the cart happens, and Valjean saves the man by lifting the cart. Javert tells Valjean (dialogue is entirely sung) that Valjean's strength reminds him an escaped convict who was recently re-arrested and about to face trial. Valjean sings "Who Am I?" which ends with him bursting into the courtroom and revealing - to Javert, who is present in the courtroom - that he is Jean Valjean, and then runs off to the hospital. When they confront each other after Fantine dies, they fight, and Valjean knocks out Javert and runs. They do not meet again until the attempted robbery in Paris, 10 years later.
-In the film, Javert returns much earlier, as the new police inspector of the town of which Valjean is the mayor. They meet on reasonably friendly terms (Javert not recognizing Valjean), but they are interrupted by a cart accident outside. Valjean lifts the cart and saves the man - similar to the prisoner Valjean lifting the mast, and Javert suspects that the mayor is Valjean. He reports his suspicions, and which is when he learns that 'Valjean' has been re-arrested. Javert reports himself to Valjean for suspecting him, offers his resignation and asks Valjean to charge him for his disloyalty, which Valjean refuses. After Javert leaves, Valjean, knowing that the wrong man is about to go to jail, sings "Who Am I" and bursts into the courtroom, confessing to the judge, not Javert, who isn't there like he is in the stage version. He goes to the hospital, where Fantine dies, and instead of knocking Javert out during their confrontation, he jumps from a window and to the river to escape.
-On stage, Fantine fights with another factory woman over a note regarding her daughter. Valjean enters, breaks up the fight, and leaves the rest to the foreman. Fantine is fired, and this is when she sings "I Dreamed a Dream". Then she goes to the docks, where she sells her locket and her hair, and ultimately becomes a prostitute. She almost gets arrested, but is rescued by Valjean, who instructs a police officer to carry her to the hospital, where she dies.
-In the film, Fantine still has the fight and Valjean intervenes, but he leaves because he was distracted by the arrival of Javert. When Fantine is fired, in the film, she screams for Valjean to help her. She goes to the docks, sells her locket, her hair, her teeth, and becomes a prostitute. "I Dreamed a Dream" is now sung after she's with her first...customer. Valjean rescues her from being arrested, but he carries her to the hospital himself. Her death scene on stage had her singing deliriously to her absent daughter, the scene in the film now includes the little girl actually appearing to her behind a screen. All of her scenes have new lyrics and dialogue that were not in the stage version (like her locket containing a lock of Cosette's hair).
-Little Cosette admires a doll in a shop window, which wasn't in the stage version but was in the original novel, and has a rag that she uses for a pretend doll. Valjean buys her the doll (on stage, he had a doll in his bag that he gave to her, but that was its first appearance). Little Eponine is now part of the Master of the House scenes, when on stage she only appeared when Madame Thernardier was tormenting Cosette. Master of the House in the film now includes a drunken Santa.
-"Suddenly" is the new song. Yes, it's Oscar bait, but every movie musical adaptation does that (Dreamgirls had 3 new songs, for god's sake), so it shouldn't be a surprise here. And it is from a chapter in the book.
-In the stage version, Valjean takes Cosette from the Thernardiers, and they are last seen heading into Paris, Cosette in new dress and carrying a new doll. The story shifts into the Paris scenes, 10 years later. There's no run-in with Javert. In the film, Javert turns up just after Valjean takes Cosette, and there's a chase. Valjean and Cosette wind up at the convent, and given a place to hide by the groundskeeper - who turned out to be the man Valjean rescued from the fallen cart. Having lost Valjean again, Javert stands on a rooftop, sings "Stars" and the story shifts to the Paris scenes, nine years later. On stage, Javert doesn't sing "Stars" until Valjean escapes him after the attempted robbery in Paris.
-Marius' grandfather was not in the stage version, and there's no reference on stage that he's actually rich. The dialogue between him and Eponine in his flat is entirely new. Gavroche sings directly to the audience on stage, in the film his introduction is to a rich man in a carriage, with a gang of urchins following behind him. "Do You Hear the People Sing?" directly follows "Red & Black" on stage, with the students streaming into the streets to gain support for their rebellion. In the film it is sung later, at General Lamarque's funeral, as the start of their rebellion. Lamarque's funeral was referenced on stage, but never seen.
-The whole love triangle was done differently on stage: Eponine brought Marius to Cosette, but Marius was still there when her father's attempted robbery happened. He escaped just in time, but was there to overhear Valjean's plans to leave with Cosette. Marius is torn between following Cosette or joining his friends at the barricade, and ultimately goes to the barricade. Eponine follows him, dressed as a boy, and when Marius discovers her, he sends her off with a note to Cosette, which is intercepted by Valjean. Eponine sings "On My Own", and is shot and killed returning to the barricade.
-In the film, Marius has left by the time the attemped robbery happens, and never learns of Valjean's plans to leave with Cosette. Cosette leaves a note for Marius of their plans, which Eponine finds and reads. She's on her way to bring the note Marius, which is when she sings "On My Own". She decides to not give the note to Marius, and he returns to Cosette's house to find it deserted. Not knowing where she went, he runs off to the barricade. Eponine dresses as a boy and joins him, but when a soldier tries to shoot Marius, she pulls the rifle away and winds up being shot and killed. Before she dies, she finally gives Marius the note from Cosette and tells him she's sorry for hiding it from him. Marius writes his note to Cosette, and it's little Gavroche who brings the note that is intercepted by Valjean.
-On stage, there is only one barricade. The movie shows that there were barricades all over the city. Marius never tries blow up the barricade with a powder keg in the stage version. The French soldiers are never seen, and when the barricade falls, all of the students are killed on the barricade. In the film, the soldiers make it to the other side of the barricade, and are chased into the tavern, where most of them are killed. Enjolras and Grantaire are the last ones shot. Marius was shot and seemingly left behind, where in the stage version, Enjolras freaked out when Marius was shot and ran to the top of the barricade and started swinging the flag, where he was killed.
-When Gavroche went to the collect the ammunition, he took a bag with him that he filled with the ammunition. When he was shot, and it was clear he wouldn't make it back, he threw the ammunition bag back over the barricade, started singing in the direction of the shots, and was killed. In the film, he's holding all of the ammo and reaching for more when he is killed. On stage, his body stayed where it was, in the film, the students ran out and carried him back over the barricade. The soliders who shot him looked horrified about killing him, where in the show we never saw the soldiers. Javert pinning his medal on Gavroche's body was not in the stage version.
-When Valjean is dying, Fantine appears to tell him his sins are forgiven and that he will go into heaven. On stage, Eponine also appears, reaching out her hand to lead him away. In the film, Eponine does not appear, since in the film, she and Valjean never met. After Valjean dies in the film, he is met instead by the Bishop, who saved him all of those years ago, to lead him to heaven, where he finds everyone who died at the barricade.
So, no. Not a "straight-rip" from the stage musical at all. Songs are shifted to different places, the plotlines of several of the characters are changed, new locations are introduced that weren't in the stage version,, and lot of stuff from the original novel that didn't happen on stage was included. There's new dialogue, changes to existing songs, and not just the new obvious Oscar-bait song, there's entirely new sung dialogue.
It definitely can fall under adapted screenplay.